// 实现这个项目的构建任务
const {src, dest, parallel, series, watch} = require('gulp')

const del = require('del')
const browserSync = require('browser-sync')

const bs = browserSync.create()

const loadPlugin = require('gulp-load-plugins')
const plugins = loadPlugin()

const data = {
  menus: [{
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [{
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const clean = () => {
  return del(['dist', '.temp'])
}

const style = () => {
  return src('src/assets/styles/*.scss', {base: 'src'})
    .pipe(plugins.sass({
      outputStyle: 'expanded'
    }))
    .pipe(dest('.temp'))
    .pipe(bs.reload({
      stream: true
    }))
}

const script = () => {
  return src('src/assets/scripts/*.js', {base: 'src'})
    .pipe(plugins.babel({
      presets: ['@babel/preset-env']
    }))
    .pipe(dest('.temp'))
    .pipe(bs.reload({
      stream: true
    }))
}

const page = () => {
  return src('src/**/*.html', {base: 'src'})
    .pipe(plugins.swig({
      data,
      defaults: {
        cache: false
      }
    }))
    .pipe(dest('.temp'))
    .pipe(bs.reload({
      stream: true
    }))
}

const image = () => {
  return src('src/assets/images/**', {base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
  return src('src/assets/fonts/**', {base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
  return src('public/**', {base: 'public'})
    .pipe(dest('dist'))
} 

const serve = () => {
  watch('src/assets/styles/*.scss', style)
  watch('src/assets/scripts/*.js', script)
  watch('src/**/*.html', page)

  watch([
    'src/assets/fonts/**',
    'src/assets/images/**',
    'public/**'
  ], bs.reload)

  bs.init({
    notify: false,
    port: 3010,
    server: {
      baseDir: ['.temp', 'src', 'public'],
      routes: {
        '/node_modules': 'node_modules'
      }
    }
  })
}

const useref = () => {
  return src('.temp/**/*.html', {base: '.temp'})
    .pipe(plugins.useref({searchPath: ['.temp', '.']}))
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    })))
    .pipe(dest('dist'))
}


const complie = parallel(style, script, page)
const build = series(clean, parallel(series(complie, useref), image, font, extra))

const dev = series(clean, complie, serve)
module.exports = {
  clean,
  build,
  dev
}
